A Puerto Rico dam damaged by Hurricane Maria's heavy rains remained in danger of failing early Monday, amid fears it might trigger a potentially life-threatening deluge. The National Weather Service said a flash flooding warning in western Quebradillas and eastern Isabela municipalities, where the Guajataca Dam is located, would continue until 2 p.m. ET on Monday. “Stay away or be swept away,” the agency warned. "River banks and culverts can become unstable and unsafe. Stay away from evacuated areas until told by emergency officials it is safe to return."nbcnews.com/news/us-news/puert...wochit.com